Revolving derrick



May 1927 .1. w. PAGE REVOLVING DERRICK Fil'ed Oct. 6, 1924 4Sheets-Sheet 1 May 3 1927. 1,627,249

J. W. PAGE REVOLVING DERRICK Filed Oct. 6, 1924 4 Sheets-Sheet 2fez/62%???- May 3 1927.

1,627,249 J. w. PAGE REVOLVING DERRICK Filed Oct. 6, 1924 4 Sheets-Sheet3 eiz 0/;

Jo'iwz Fag 4 Sheets-Sheet 4 ay .1. w. PAGE REVOLVING DERRICK Filed Oct.6, 1924 MN M m W M 4 Patented May 3, 1927.

UNITED STATES JOHN 'W. PAGE, OF CHICAGO, ILLINOIS.

REVOLVING DERRICK.

Application filed October 6, 1824. Serial No. 741,923.

'This invention relates to improvements in revolving derricks, includingin such term revolving cranes, revolvingexcavators and the like. Myimproved revolving derr ck is so constructed that it may be readilymoved in any direction and also around curves or angles. In the practiceof my mvention I make use of'the turntable forming an integral part ofthe revolving derrick to assist in moving the derrick around corners.The turntable, therefore, performs a double function. That is, itperforms its regular duty in connection with the operations of therevolving derrick while excavating, for example; and also forms a partof the movingapparatus as will be described more in detail hereinafter.

My improved revolving derrick is also easy and simple to construct andoperate. Other features and advantages of my 111- vention will appearmore fully as 1 proceed with my specification.

In that form of device embodying the features of my invention shown inthe accom panying drawings- Fig. 1 is a view in side elevation showing arevolving derrick, here shown, for purpose of illustration, as anexcavator (partly shown) Fig. 2 is a similar view in top plan;

Fig. 3 is a view taken as indicated by the line 33 of Fig. 2;

Fig. 4 is a view taken as indicated by the line 4-4 of Fig. 2 on anenlarged scale; and

Fig. 5 is a view taken as indicated by the line 5-5 of Fig. 2 on anenlarged scale.

As shown in the drawings, 11, 11 indicates suitable transverse andlongitudinal beams which are suitably joined and braced to form asubstantially flat rectangular structure. The structure 11 may becompletely or partially covered with decking 10, as desired. Thearticular construction of the rectangular at structure 11 forms no partof the present invention and consequently is not shown in detail liere.An wellknown practice may be followed in orming a suitably shaped flatstructure adapted to carry the machinery, or other apparatus used.

Mounted on the structure 11, in any Wellknown manner, is the engine ormotor, such as an internal combustion engine as indicated by 12,designed to furnish the necessary power to operate the excavating orother machinery carried by the support and also to operate the supportitself, as will be described more in detail hereinafter. For

the purpose of illustration merely, I have here shown as mounted on thesupport a boom 13 from the outer end of which (not shown) 1s supportedan excavatin or scraper bucket adapted to be hauled y a rope 14 in orderto drag the bucket through the material to be loaded in accordance withwell-known practice. The particular construction and operation of theexcavating machinery forms no part of the present invention and istherefore only partly shown herein. It is obvious that the support ordeck 10 might also carry some other kind of excavating machinery, adredge, a pile drlver, or scraper, or any similar mechanism orapparatus.

At the center of the rear end of the support there is mounted avertically movable spud, leg, or supporting member 15. Two similarsupports 16 and 17 are mounted at the forward end of the support nearthe corners. Since each of the vertically movable supports, 15, 16 and17 is similar in construction and operation, I will describe indetail-but one. For example, the support 15 (see Fig. 5) includes avertically movable post, or elongated member, adapted to slidevertically in a guide 18. The face of the sliding member adjacent thedeck or support is provided with a rack bar 19 en gaged by a pinion 20adapted .to be rotated by a suitable train of gears connected to themotor 12, as shown; so that by rotation of the pinion 20, the support,leg, or spud 15 may be raised or lowered as desired. The

bottom of the spud, or leg, or support 15 is lar structure 11, 11. Theturntable referred no to comprises a circular supporting base 23 havingmounted thereon a circular rail 24.

It is to be understood that the adapted to run on the rail 24. Above thewheels is arranged another circular rail 26 carried on the underside ofthe upper part 27 of the turntable. The upper part 27 of the turntableis provided with a air of I-beams 28,28 on each side, arrange as shownin Fig. 4. The structure 11 carries on its under surface at each side alongitudinally arranged I-beam .29'having its lower flange lyingunderneath the ad acent edges 31, 31 of the pair of I beams 28, 28.By'means of this construction see Fig. 4), the upper part 27 of theturntab e is sup;

will serve to pull the turntable backwardl and forwardly under thestructure 11. he drum 40 may be rotated in any suitable manner; forexample, by any suitable gear connections to the motor 12.

The following means are provided for rotating the turntable. Thecircular rail 24 carries an internal gear 41 with which meshes a pinion42 mounted on the lower end of a vertical shaft 43 carried by the upperpart 27 of the turntable. The upper end of the shaft 43 carries anotherpinion 44 adapted to be engaged by a pinion mounted on a vertical shaft46 carried by the structure 11.

ported by engagement of the edges 31 of tlnx The shaft 46 carries on itsupper end a bevel I-beams 28, 28 on the flange 30. Strips ofanti-friction metal 32, 32 are placed between the engaging surfaces inorder to lessen friction. It will be seen therefore that the upper art27 of the turntable han s on the I- "beams 29, 29 and it is to be unerstood that on the lower side of the rectangular struc' ture 11 thereare two such I-beams, one on each side, extending substantially theentire length of the structure so that the turntable is adapted to slideunderneath the structure from one end to the other. When the legs 15 16and 17 are down, the turntable hangs by engagement of the edgesof theflanges 31 on the edges of the flange 30, with the anti-friction metal32 between. When the legs 15, 16 and 17 are raised so that the weight ofthe excavating device is resting on the turntable, the I-beams 29 movedownwardly slightly until their lower flanges 30 rest on the supportingrollers 33 mounted between each-pair of I-beams 28, 28. When the deviceis resting on the turntable, with the legs raised, the structure may bemoved backwardly and forwardly longitudinally on the rollers 33.

When the turntable is raised; that is, when the legs 15, 16 and 17 aredown, as shown in Fig. 3, the lower part 23 of the turntable hangs fromthe upper part by means of the central. supporting pivot 34 which hasits upper end projecting up into the part 27 and provided with a headand a thrust bearing 35 so that when the turntable is thus supported thelower circular part 23 hangs from the upper part 27.

The fol owing means are provided for sliding the turntable backwardlyand forwardly on the structure, or sliding the structure backwardly andforwardly on the turntable, depending upon whether the structure isresting on the turntable or on the legs 15, 16 and 17. Attached to theupper part 27 of the turntable 36 is arope 37 extending around a pulley38 at one end of the structure 11 and thence around a pulley 39 at theother end of the structure 11, thence over a drum 40, thence back overthe pulley 39 and thence back to the point of attachment 36. It isobvious that rotation of the drum gear 47 meshing with a bevel gear 48mounted on the shaft 49, which, in turn, may be rotated by any suitablegear connections with the motor 12, or in any other desired manner. Theparticular gear connections between the motor and the pinion'45, or thedrum 40, or the pinions 20, used to operate the spuds, form no part ofthe present invention, and, consequently, are not shown ordescribed indetail herein. It is obvious that any suitable motor, or engine,connected in any suitable manner, may be used to drive any of theseparts. 7

It is to be noted that the pinion 45 is carried b the structure 11 andthe pinion 44 carrie by the upper part of the turntable.

Consequently, these two pinions will not be in mesh all the time thatthe turntable slides backwardly or forwardly underneath the structure.There is only one position in which these pinions will be in mesh. Ihave here shown these pinions in mesh when the turntable is in theposition shown in Fi s. 1 and 2; that is, at the forward end of t esupport. When in this position, with the pinions 44 and 45 in mesh, theturntable ma be rotated. In its other positions as it sli es back ofthis forward position, the pinions 44 and 45 are disen a ed so that theturntable cannot be rotatet i. If desired, however, there could beprovided another rotating-pinion 45 at the other end of the support.

In the operation of the device, the ver tically movable legs 15, 16 and17 are forced down until the turntable is raised off of the ground. Theturntable is then slid to the front end of the device. .The legs arethen raised until the excavator rests on the turntable. The excavator isthen slid forwardly on the turntable, until the turntable is at the rearend of the excavator. The legs are then again lowered until theturntable is off of the ground, and the turntable then again slid to thefront of the excavator. It will be seen that in this manner, theexcavator can be moved or caused to walk over the surface. It is to benoted particularly also that when the excavator is resting on theturntable while it is at the forward end with the gears 44 and 45 inmesh, that the same may be rotated as desired before again lowering thelegs in order to lift the turntable off the ground. By thisconstruction, therefore, it is possible for the excavator to travel orbe moved not only in a straight line but also around any desired angleor curve.

50 indicates a stop adapted to hold the turntable at the extreme forwardend of its slide with the gears 44 and 45 in mesh. This stop is pivotedat 51 and when down, engages the upper part 27 of the turntable toprevent it from sliding back. When the line 37 is pulled, however, theshort lever 52 is rocked on its pivot 53 to raise the stop 50 anddisengage it from the turntable. The

point of attachment 36 of the rope 37 to the,

turntable is on the lower end of the pivoted lever 52.

While I have shown and described certain embodiments of my invention, itis to be understood that it is capable of man modilications. Changes,therefore, in t e construction and arrangement may be made withoutdeparting from the spirit and scope of the invention as disclosed in theappended claims, in which it is my intention to claim all noveltyinherent in my invention as broadly as ossible in view of the prior art.

It is to be noted that the turntable referred to herein constitutes aninte a] part of the revolving derrick as a whoa: That is, a turntable isused durin the regular operations of the revolving errick and isnecessary to its operation. This turntable is also made use of and formsa part of the movin mechanism of the apparatus. In fact, t e bottom partof the turntable constitutes the regular supporting base for therevolving derrick as such. Thus, the superstructure of the revolvingderrick is rotatably supported on its supporting base.

What I claim as new, and desire to secure by Letters Patent, is:

1. A revolving derrick comprising a superstructure and a supportingbase; said superstructure being rotatably and slidably mounted on top ofsaid supporting base; and means for raising or lowering saidsuperstructure, said supporting base adapted to hang from the undersideof said superstructure and be supported thereby when said superstructureis raised.

2. A revolvin derrick comprising a superstructure and a supporting base'said superstructure being rotatably and slldably mounted on top of saidsupporting base; locking means for holding said supportin base at oneend of its sliding movement; an means for raising or lowering saidsuperstructure, said supporting base adapted to hang from the undersideof the superstructure and be supported thereby when said superstructureis raised.

Witness my hand this 3 day of October, 1924. 1

JOHN W. PAGE.

